Lock handle assembly with limited angular movement

Claim 1

A lock handle assembly comprises: a casing having a central hole; a sleeve rotatably fitted in said central hole, and having an inner and outer end respectively extending inwardly and outwardly from said central hole; a lever handle having a rotary shaft detachably fitted in said sleeve and rotatable together with said sleeve; a rotary plate mounted on said sleeve inside said casing, said rotary plate having a radially extending forward engaging member and two radially extending backward engaging members angularly spaced from said forward engaging member at two sides of said forward engaging member; a left and right female screw member extending axially inward from said casing at two diametrically opposite positions relative to said sleeve member; a coiled torsion spring disposed inside said casing around said central hole and having a left radial leg to engage said left female screw member and a right radial leg to engage said right female screw member; a first stop member extending axially inward from said casing between said female screw members; a second releasable stop member extending axially inward from said casing between said female screw members and opposite to said first stop member; said rotary plate being selectively set at one of a first operative position and a second operative position, said forward engaging member being adjacent to said left female screw member when in said first operative position, said forward engaging member being adjacent to said right female screw member when in said second operative position; said forward engaging member moving toward said first stop member carrying said left radial leg of said torsion spring away from said left female screw member when said rotary plate is turned while it is in said first operative position, one of said backward engaging members moving toward said second releasable stop member by the action of said left radial leg when said rotary plate is released, the angular movement of said handle being limited by said forward engaging member and said one backward engaging member, said forward engaging member moving toward said first stop member carrying said right radial leg of said torsion spring away from said right female screw member when said rotary plate is turned while it is in said second operative position, the other one of said backward engaging members moving toward said second releasable stop member by the action of said right radial leg when said rotary plate is released while it is in said second operative position, the angular movement of said handle being limited by said forward engaging member and said other one of said backward engaging member when said rotary plate is in said second operative position, said lever handle being detachable from said sleeve, thereby permitting said handle to be replaced by a new handle to match the used position of said rotary plate.